(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[19]KM[0.00]TM[] PW[White]PB[Black]AW[rl][pm][rm][rn][oo][po][qo][op][oq][pq][qr][ps]AB[sn][ro][pp][qp][rp][qq][sq][rr]C[how can white best attack the black group?]PL[W] (;W[rs]CR[rs] ;B[so]CR[so] (;W[sr]CR[sr]C[RIGHT white makes a ko]) (;W[ss]CR[ss] ;B[sr]CR[sr]) (;W[sm]CR[sm] ;B[sr]CR[sr])) (;W[sr]CR[sr] ;B[rs]CR[rs] (;W[so]CR[so] ;B[sp]CR[sp]) (;W[qs]CR[qs] ;B[ss]CR[ss]) (;W[sm]CR[sm] ;B[so]CR[so])) (;W[ss]CR[ss] ;B[rs]CR[rs]) (;W[sm]CR[sm] ;B[rs]CR[rs]) (;W[sp]CR[sp] ;B[rs]CR[rs]) (;W[qs]CR[qs] ;B[rs]CR[rs]) (;W[so]CR[so] ;B[rs]CR[rs]))